CVE-2025-29660: Arbitrary Script Execution Vulnerability in Yi IOT XY-3820

Overview

The CVE-2025-29660 vulnerability is a critical security flaw that exists in the daemon process of the Yi IOT XY-3820 v6.0.24.10. This vulnerability can potentially lead to system compromise or data leakage. This issue primarily affects devices running the specified version of the software, and it matters because this vulnerability provides a loophole for attackers to execute arbitrary scripts present on the device, giving them the potential to take control of the device or access sensitive data.

Vulnerability Summary

CVE ID: CVE-2025-29660
Severity: Critical, 9.8 (CVSS v3.0 Severity)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Yi IOT XY-3820 | v6.0.24.10

How the Exploit Works

The vulnerability resides in the daemon process of the Yi IOT XY-3820 v6.0.24.10, which exposes a TCP service on port 6789. This service does not have proper input validation, thereby enabling attackers to execute arbitrary scripts on the device. Attackers can craft special TCP requests using directory traversal techniques to exploit this vulnerability.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability:

POST /../../../../etc/passwd HTTP/1.1
Host: target.example.com:6789
Content-Type: application/json
{ "arbitrary_script": "cat /etc/passwd" }

In the above example, the attacker is using directory traversal (`/../../../../etc/passwd`) to access a sensitive file and execute a script (`cat /etc/passwd`) that outputs the contents of the ‘passwd’ file, which contains user account details.

Mitigation

To mitigate this vulnerability, it is highly recommended to apply the vendor patch once it is available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to detect and block attempts to exploit this vulnerability. Regular monitoring and updating of the devices can also reduce the risk of exploitation.